MySQL C++连接器[ mySQL连接器-c++-0.0.19-LIUX-GLYBC2.2.x8664位]

我的应用程序崩溃：

调试时：

#0  __memmove_sse2_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:371
#1  0x00007ffff7301c80 in std::string::append(std::string const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#2  0x00007ffff7634efe in sql::SQLString::append (str=..., this=0x7fffffffdc10)
    at /export/home/pb2/build/sb_0-32258110-1547655664.03/mysql-connector-c++-1.1.12/cppconn/sqlstring.h:155
#3  sql::mysql::MySQL_Connection::setSchema (this=0x55555578bed0, catalog=...)
    at /export/home/pb2/build/sb_0-32258110-1547655664.03/mysql-connector-c++-1.1.12/driver/mysql_connection.cpp:1345
#4  0x000055555555585d in main () at ../Crebaco/main.cpp:25

---

来自GDB的调用堆栈，我在使用mysql-connector-c++-1.1.12时遇到了相同的错误。代码非常简单。这不是答案，您可以尝试使用此代码连接到您的mysql实例吗

//export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/asif/Desktop/QT/Crebaco/mysql-connector-c++-8.0.19-linux-glibc2.12-x86-64bit/lib64

#include <iostream>
#include "mysql_connection.h"
#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>
#include <cppconn/prepared_statement.h>

using namespace std;

#define SERVERSTRING "tcp://127.0.0.1:3306"
#define USER "root"
#define PASSWORD "password"
#define DATABASE "test"

int main()
{
    cout<<"Content-Type: application/txt\r\n\r\n";

    try {
      static sql::Driver *driver=get_driver_instance();
      shared_ptr<sql::Connection> con(driver->connect("127.0.0.1:3306","asif", "password"));
      con->setSchema("asif");

      shared_ptr<sql::Statement> stmt(con->createStatement());
      shared_ptr<sql::ResultSet> res(stmt->executeQuery("select * from tab1"));

      while (res->next()) {
          cout << res->getString("name") << endl;
      }

    }catch(sql::SQLException &e)
    {
        cout << "# ERR: " << e.what()<<endl;
        cout << "MySQL error code: " << e.getErrorCode()<<endl;
          //cout << ", SQLState: " << e.getSQLState()<<endl;
    }

    return 0;
}

---

您很可能无法连接到数据库。检查用户名、密码等。您好，我已经连接到数据库，condriver->connect127.0.0.1:3306，asif，password；通过，当我调用setschema时失败。如果我输入了错误的密码，它会正确地告诉我。调试器会怎么说？con看起来怎么样？例如，您可以获得一个segv，以防con为空。我检查了它，它不是空的，我已重新发送post以将堆栈展开。

#0  __memmove_sse2_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:371
#1  0x00007ffff7301c80 in std::string::append(std::string const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#2  0x00007ffff7634efe in sql::SQLString::append (str=..., this=0x7fffffffdc10)
    at /export/home/pb2/build/sb_0-32258110-1547655664.03/mysql-connector-c++-1.1.12/cppconn/sqlstring.h:155
#3  sql::mysql::MySQL_Connection::setSchema (this=0x55555578bed0, catalog=...)
    at /export/home/pb2/build/sb_0-32258110-1547655664.03/mysql-connector-c++-1.1.12/driver/mysql_connection.cpp:1345
#4  0x000055555555585d in main () at ../Crebaco/main.cpp:25

//export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/asif/Desktop/QT/Crebaco/mysql-connector-c++-8.0.19-linux-glibc2.12-x86-64bit/lib64

#include <iostream>
#include "mysql_connection.h"
#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>
#include <cppconn/prepared_statement.h>

using namespace std;

#define SERVERSTRING "tcp://127.0.0.1:3306"
#define USER "root"
#define PASSWORD "password"
#define DATABASE "test"

int main()
{
    cout<<"Content-Type: application/txt\r\n\r\n";

    try {
      static sql::Driver *driver=get_driver_instance();
      shared_ptr<sql::Connection> con(driver->connect("127.0.0.1:3306","asif", "password"));
      con->setSchema("asif");

      shared_ptr<sql::Statement> stmt(con->createStatement());
      shared_ptr<sql::ResultSet> res(stmt->executeQuery("select * from tab1"));

      while (res->next()) {
          cout << res->getString("name") << endl;
      }

    }catch(sql::SQLException &e)
    {
        cout << "# ERR: " << e.what()<<endl;
        cout << "MySQL error code: " << e.getErrorCode()<<endl;
          //cout << ", SQLState: " << e.getSQLState()<<endl;
    }

    return 0;
}